document.write( "Question 811185: a laboratory technician needs to make a 90% liter batch of a 20% acid solution. How can the laboratory technician combine batch of an acid solution that is pure acid with another that that is 10% to get the desired concentration \n" ); document.write( "
Algebra.Com's Answer #488642 by ankor@dixie-net.com(22740)\"\" \"About 
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a laboratory technician needs to make a 90 liter batch of a 20% acid solution.
\n" ); document.write( " How can the laboratory technician combine batch of an acid solution that is pure acid with another that that is 10% to get the desired concentration
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\n" ); document.write( "Let x = amt of pure acid
\n" ); document.write( "the result is to be 90 liters, therefore
\n" ); document.write( "(90-x) = amt of 10% solution required
\n" ); document.write( ":
\n" ); document.write( ".10(90-x) + x = .20(90)
\n" ); document.write( "9 - .1x + x = 18
\n" ); document.write( ".9x = 18 - 9
\n" ); document.write( ".9x = 9
\n" ); document.write( "x = 9/.9
\n" ); document.write( "x = 10 liters of pure acid required
\n" ); document.write( "then
\n" ); document.write( "90 - 10 = 80 liters of the 10% solution required
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "See if that checks out
\n" ); document.write( ".10(80) + 10 = .20(90)
\n" ); document.write( "8 + 10 = 18; confirms our answer
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